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Discover everything Scribd has to offer, including books and audiobooks from major publishers. Start Free Trial Cancel anytime. Report this Document Download Now Save Save Elster Energy Meter Manual For Later 50 (2) 50 found this document useful (2 votes) 8K views 192 pages Elster Energy Meter Manual Uploaded by grasimlook Description: Full description Save Save Elster Energy Meter Manual For Later 50 50 found this document useful, Mark this document as useful 50 50 found this document not useful, Mark this document as not useful Embed Share Print Download Now Jump to Page You are on page 1 of 192 Search inside document Browse Books Site Directory Site Language: English Change Language English Change Language. All rights are reserved.No part of this software or documentation may be reproduced, transmitted, processed or recorded by any means or form, electronic, mechanical, photographic or otherwise, translated to another language, or be released to any third party without the express written consent of Elster Electricity, LLC. Printed in the United States of America. NoticeThe information contained in this software and documentation is subject to change without notice. Product specifications cited are those in effect at time of publication. Elster Electricity, LLC shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. Elster Electricity, LLC expressly disclaims all responsibility and liability for the installation, use, performance, maintenance and support of third party products. Customers are advised to make their own independent evaluation of such products. ALPHA and ALPHA Plus are registered trademarks and Metercat and AlphaPlus are trademarks of Elster Electricity, LLC. RPM Rotary Gas Meters.
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The A1800 ALPHA meter can be easily upgraded and offers our customers the flexibility to keep pace with their changing metering requirements and business growth. The site diagnostic capability continuously monitors the service, verifying that all phases are present and that the wiring configuration is correct. Adverse or abnormal conditions, such as phase outages and reverse energy events, are logged. When equipped with the optional DLMS communication support, the meter supports both ANSI C12 and DLMS communication. When establishing a communication session, the meter automatically determines the protocol being used and responds in the same protocol. The information contained in the data sheet is subject to change as features are added to the meter. No part of this softwar e or documentation may be rep roduced, transmitted, processe d or r ecor ded by any m eans or form, electro nic, mechanical, phot ographic or otherw ise, translated to a nother language, or be r eleased to a ny third party without th e express w ritten consent of Elster Electricity, LLC. Printed in the United States of Americ a. ALPHA, ALPHA Plus, and EnergyAxis are r e gistered trad emarks, and REX, Meter cat, and AlphaPlus ar e trademark s of Elster Electricity, LLC. DISCLAIMER OF W ARRANTI ES AND LIMIT A TIONS OF LIABILITY There are no understandings, agr eements, re presentations, or warranties either ex pr ess or implie d, including war ranties of mer- chantability or fitness for a particular purpose, other than th ose specifically set out by a ny existing contract between the pa rties. Any such contract states the entire o bligatio n of the seller. The contents of this docu ment s hall not be come pa rt of or modify any prior existing a greement, commitment, or r elationship.
The informatio n, reco mmendations, descripti ons, and safety notices in this document are based on Elster Electricity, LL C expe- rience and judgment with re spect to operat io n and maintenance of the described pr oduc t. This in formation shoul d not be con- sidere d as all-inclusive or cover ing all contingencies. If further information is r equire d, Elster Electricity, LLC should be c onsulted. No warranti es, either expr essed or implied, i ncluding warranties of fitness for a particular purp ose or mer chantability, or war ran- ties arisi ng from the co urse of dealing or usage of trade, ar e ma de regar ding the information, r ecommendations, descr iptions, warnings, and caut ions contained herein. In no event will Elster Electricity, LLC be r esponsible to the us er in contract, in tort (including negligenc e), strict liabili ty or ot her- wise for any spec ial, indir ect, inciden tal, or consequential damage or loss wh atsoever, including but n ot limited to: damage o r loss of use of e quipment, cost of capital, loss of pro fits or re venues, or claims against the us er by its customers re sulting f rom the use of the information, r ecommendati ons, desc riptions, and safety notices contained herein. O peration is subject to the follo wing t wo conditio ns: 1. This de vice may n ot caus e harmful int erference, and 2. This de vice must ac cept any i nterference received, i ncludin g interference that may cause undesired operation W arning (Part 15.21) Changes or m odification s not expressly approved by Elster E lectrici ty, LLC could void th e user’ s authorit y to operat e the equ ipment. RF Radiation Safety Guideli nes per Part 2 of FCC Rules and Regulations The met er should be installe d in a locat ion where there will b e a separa tion greater than 20 cm from location s occup ied by hum ans on other t han an incidental or transitory basis.
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User I nformation The REX m eter has been t ested and f ound to compl y with the li mits for a Class B d igital de vice, pursu ant to Par t 15 of t he FCC Rul es. These l imits are designe d to provide reasonable protection ag ainst harmf ul interference in a residential install ation. This equipment g enerates, uses and can radi ate radio frequency energy an d, if not ins talled and u sed in acco r dance wi th the instruct ions, may ca use harmf ul interf erence to radio com municatio ns. T echnical Manual REX Meter Any su ch contrac t states the e ntire obligation of the seller. The content s of this tech nical manual shall not become part of or modi fy any prior or existing agreemen t, commit ment, or relati onship. The inform ation, recommend ations, desc riptions, and safety not ices in this technical man ual are based on Elster Ele ctricity, LLC experience a nd judgment with respect to the operat ion and m aintenan ce of the d escribed p roduct. If furth er information is required, Elster Electri city, LL C should be consulted. No warra nties, ei ther expressed or imp lied, in cluding w arranties o f fitness for a particul ar purpose o r merchantabi lity, or w arrantie s arising from the co urse of dealing or usage of trade, are made regar ding the informat ion, recommendations, descriptio ns, warn ings, and cautions con tained herein. In no event wil l Elster Electricit y, LLC b e held responsible to the use r in co ntract, in tort (i ncluding n egligenc e), strict li ability, or otherwi se for any special, indirect, incidental, or conseq uential damage or loss whatsoe ver, inc luding bu t not limited t o: damage or lo ss of use of eq uipment, cost of capital, lo ss of profits or revenues, or clai ms against t he user by its customers f rom the use of the informati on, recommendatio ns, descrip tions, and saf ety notices co ntained here in. Wi thin this man ual, safe ty notices app ear preceding the te xt or step to w hich they apply.
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Safet y notices are divi ded int o the foll owing 4 clas sificati ons: Notice is u sed to alert personnel t o installatio n, operation, or maintenan ce inform ation th at is importa nt but not h azar d r elated. Cautio n is used t o alert per sonnel t o the presence of a hazard that will or can cause minor personal injury, equipment damage, or property damage if the notice is ignor ed. W arnin g is used to alert pe rsonnel t o the presence o f a haza r d that can cause severe personal inj ury, death, eq uipment dama ge, or property d amage if not ice is ignored. Danger is used to aler t personnel t o the presence of a hazard that will cau se severe personal inj ury, death, eq uipment dama ge, or property d amage if th e notice is ignor ed. The documen t number and its revision are located at t he bottom o f each page. The followin g table li sts the revisions t o this docum ent, the date of the release, and any not es about th e changes made. Revision Date Brief Description A 12 August 2 003 First release of the document. B 30 July 200 4 Changed layout of the docu ment. Ch anged name of “service disconnec t switch” to “serv ice control switc h” in Chapter 1. C Adde d informat ion regarding For m 12S m eters. This meter mee ts or exceeds A NSI C12.1, C 12.10, C1 2.20, and ot her appropriate industry standar ds. While capa ble of operati ng as a stand-alo ne meter for c ertain funct ions, the REX meter is p rimarily d esigned t o provide a fle xible meteri ng platf orm that ca n operate with a va riety of com municatio ns tech nologies to provide remote or automated meter dat a collect ion, also referred to as au tomated m eter reading (AMR). The meter co nsists of a socket-mounted meter encl osure with current and voltage sensors con nected to a pow erful mic ropr ocessor - based mete ring calculatio n engine. The unit measures, pr ocesses, stores, and locally displays energy (kW h) and oth er related mete ring da ta via an in tegral l iquid cr ystal display.
Met ering data i s also ma de available t o AMR co mmunication s modules that can either be m ounted o nto the m ain meterin g circuit board or ad ded as optional sep arate circuit boa r ds for which space i s provided under the meter cover. The REX m eter can i nclude an i ntegral Elster Ele ctricity-d esigned radio frequency (RF) t ransmit ter and receive r module t hat operates i n the 900 M Hz unlicense d spectrum. The 900 MHz modu le allow s the REX m eter to sup port two-way com municatio ns with ot her meter s in an Elster Elect ricity-desi gned RF- based local area network (LAN ) for automat ed meter reading. The Elster Electric ity RF LAN te chnology in cludes such f unctions as au tomatic registration upon instal lation, netw ork time sync hroni zation, downloading of time-of- use (TOU) meteri ng schedules, scheduled dema nd rese t, re pro gramming of RE X functio ns, and numer ous ot her featu res. By usin g the fu ll capabil ities of it s meter en gine and t he Elster E lectrici ty 900 MHz RF LAN, the REX me ter of fers a highly fl exibl e meteri ng platf orm, allo wing impleme ntation of met ering functio ns such as b asic energy measurement (kW h), power (kW demand), T OU metering, load profile inte rval recording, and criti cal tier prici ng. Wi th the Elst er Electrici ty EnergyAxis System, any of these f eatures can be eng aged or dise ngaged remotely at an y time, thu s offering operation al flexib ility wi thou t the costs of manua l meter rea ding, equi pment cha nge-outs, site visits, meter reprogramming, an d other expens es. T echnical Manual REX Meter See Figure 1-1 for an illu stration of a REX me ter. Figure 1- 1. REX mete r Stan dards Compl iance The REX m eter meets or e xceeds the A merican N ational Stand ards Institute (ANSI) stan dards for electric ity met ering, and it is inte nded for use by sin gle phase util ity c ustom ers.
By:1 VTR:5 CTR FCC ID: QZC-RX9A TYPE R 1S The REX m eter desi gn is pa ttern ed after t he ALPHA meter technolog y whic h has establish ed a reputat ion as a reliable and accura te meter for electric al ene rgy measurement. The highly selective choice of meter componen ts provides for a very reliable meter. The R EX mete r uses nonv olatile electrica lly erasab le programmabl e read only me mory (EEP ROM) to store its customer -specific config uration p arameters a nd all met er data. If power is interrup ted, the da ta will b e preserved. Mainta inabili ty. The design provides easy acce ss to the met er circuit board and all op tion boa r ds. Ci r cuit boards may be adde d or exchan ged withou t special too ls or rewiring. Adap tabili ty. The REX me ter is de si gned so tha t it m ay be eas ily upgr aded t o support addi tional opt ion boards. The REX meter has also been desi gned to support an internal service co ntrol switch that can connect and disconnect electrica l service to a consumer. Th e service co ntrol switch must be specified at the time of o rderin g. Economy. The REX meter save s both ti me and mon ey. The REX meter is tam per -res istant. S ince ther e are no movi ng parts, traditio nal tamper ing techn iques on th e REX mete r will be l ess successful than on electromecha nical meters. The REX m eter is also a bidirectional meter. I t always m easures kWh received as well as the select ed energy quantity. A polycarbo nate cover resists cra cking and breakage du e to physica l abuse. T he meter coun ts and stores the numb er of pow er failures, which can be used to help dete ct tamperi ng with th e meter servic e. Accura cy. The REX mete r is a 0.5 accuracy class meter (as defined by ANSI C12.20) an d meets or exceeds A NSI an d IEEE requirements.S ee Figure 2-1 for the si ngle phase REX meter block di agram (i ncluding t he integra l 900 MHz radio).
S ee Figure 2-2 for the Form 12S R EX meter blo ck diagr am (includ ing the i ntegral 9 00 MHz radio ).Usin g this in put voltag e, a power supply gen erates a 6. 4 V and 3. 3 V supply. On For m 12S met ers, phase A v oltage must be p resent to power the meter ci rc uitry. Curren t and V oltage Sensing. Power line currents and vol tages are sensed using specialized current sensors and resistive dividers, r espectively. Multipl ication an d other calcu lations are perf ormed usin g an in tegrated ci rcuit (called th e met er en gin e ). The meter receiv es the current through a precision-w ound current transf ormer that reduces th e line cu rrent proportionally. The meter engine sa mples t he phase current to pr ovide accurate current measurements. The met er receives the vo ltage through resistive divi ders to ensure tha t a linear logic lev el vo ltage is m aintained. This also ser ves to mi nimize phase shift over a wide dynam ic range. The meter engi ne samples t he scaled in puts provided by the resistive div iders to p r ovid e accurate vo ltage mea surements.Multiplica tion and other calcu lations are perfor med usin g the meter engi ne. Wh en the micr ocontr oller detects a powe r failur e, it initiate s a shutdown. A shut down is the process that stores billin g and sta tus inform ation in EEP ROM. EEPROM. The R EX meter u ses EEPRO M for nonv olatile sto rage of manufact uring data, m eter con figuration d ata, and e nergy mea surement data. Th e meter en gine sampl es the volt age and current inputs, computes energ y, and sends these measurements to the microcontroller. In the meter engi ne, each pulse is e qual to on e K e defined as secon dary-rated Wh per pulse. Note: When the select ed metered quantity is kWh net, the meter calculates d emand from kWh-d elivered an d stores kWh- deliv ered pulse s for load profil ing. Demand Calculati on. Demand is t he average value of p ower over a speci fied interval of time.
Th e REX meter suppo rts the block inte rval meth od for demand calculatio n. The dem and in terval is sp ecified in mi nutes and m ust be 15, 3 0, or 60 minutes. The block interval c alculat es demand u sing the fol lowing eq uation: For examp le, if the demand interv al is 15 m inutes and t he total accumulate d energy is 50 kWh, the n the deman d is 200 kW. Maximum Demand. Maximum de mand (also referred to as in dicating demand ) is the highest demand va lue that oc curs in a billing p eriod. T he demand f or each dema nd inter val is calc ulated an d compared to an earlier maximum demand va lue. If the n ew interv al valu e exceeds the previous maximum demand, then the new dem and is stored as the m aximum dema nd (see Figure 2-3). Wh en a demand reset occurs, the maxi mum deman d is reset to zer o. The de mand for the firs t full i nterval after the de mand r eset bec omes the maximum deman d. Figure 2- 3. Maximu m demand Demand Fo r giveness. Demand forgivene ss is the time du ring wh ich demand is not calcu lated or stored afte r a power fail ure. The demand for giveness ma y be set to a numbe r between ze ro (disabled) and 255 minut es.The REX meter stores the energy dat a for up to 4 rates. W hen a season chan ge occurs, t he REX me ter invali dates the switch poin t informatio n until new switch po ints are downloa ded from the collector. T he REX met er stores energy in the defaul t tier (rate C) if the swi tch points a re invalid or i f the REX meter does not kn ow the r eal time. Wi thout the collector, t he REX me ter does no t know day type inform ation. The collecto r downloa ds calendar informa tion to the REX met er to specif y the da y type for the next 32 days. Th is 32-day cal endar is stored in the RE X meter a nd allows t he REX met er to set the day ty pe correctly at each mid night crossing.
In ad diti on to the s witc h poin ts fo r the 4 day type s, th e REX mete r ha s a separate table that allows for t ier overri des or criti cal tier pri cing. In co njuncti on with the M AS, the collect or may be t old a start t ime and a stop time for a tier override. W hen in a t ier overri de condi tion, the col lector writ es the tier override table in the R EX met er forcing the REX m eter to use t he overrid e switch poi nts for a specific p eriod of time. At the end of the overri de period, the RE X meter will revert to the standard switch p oints tha t are stored in the RE X meter’ s nonvolat ile memory.T he load profiling inte rval leng th can be different from the demand interva l leng th. Note: If the me tered quan tity is kW h net, loa d profi ling stores the number o f kWh deli vered pul ses. K h puls e divis or. A pulse div isor is used t o scale d own the numb er of K h pulses rec orded in each load profiling in terva l. This al lows recordin g of data t hat may exceed t he maximum number of pulses that can be stored in each l oad profiling inte rval (e ach interv al can store 4095 p ulses be fore overflowing ). The standard valu e of K h for all RE X meters is 1.0. If the diviso r is set to 10, then each load p rofiling pu lse count represents 10 Wh.The u ltraviole t (UV) st abilized polycar bonate cov er reflects sola r radiation, resulting in m inimize d discolora tion and reduced in tern al heating. The gra y polycarbon ate side w alls of t he meter cover reduce the i nter nal temp erature rise cause d by sun loa ding, which may extend the l ife of the el ectronic components. The cover h as a clear p lastic window that allows th e meter LCD to be view ed. Removi ng the cover r eveals the inne r housing. Nameplate The namep late is mount ed on the in ner housing. The namep late identifi es importan t informat ion abou t the mete r. For more info rmation on the namep late, see Ap pendix C, “Nameplate Informati on.
” Inner Housing The polyc arbonate i nner housi ng is de signed to provide extra protection to the electronic co mponents and to allow the RE X meter to be safely h andled w hen the meter c over is removed. Removi ng the i nner h ousing re veals the main c ir cuit boar d, optio n boar ds, cir cuit board support frame, and meter base. Meter cover Nameplate Inner housing Main circuit board w ith RF mod ule Meter base Circuit b oard support f rame. Cir cuit Boar d Support Fr ame The REX mete r cir cuit boa rd supp ort frame is designed to house the mai n circ uit board and up to three option b oards efficiently and con veniently. T wo opt ion boards can be in stalled above the main circuit board and one below the main cir cuit bo ar d using the ci rcui t boar d support fr ame. T a ble 2-2. REX meter availabl e wiring form s Meter style 1 Form T est Amps Class Elements K h T ype of serv ice ZCA3xxxxxxx 1S 30 200 1 1.0 2-wire single phase ZCA4xxxxxxx 1S 50 320 1 1.0 2-wire single phase ZCC3xxxxxxx 2S 3 0 200 1 1.0 3-wir e single phase ZCCWxxxxxxx 2S 3 0 200 1 1.0 3-wire single ph ase (without vo ltage d isconnect link) ZCC4xxxxxxx 2S 5 0 320 1 1.0 3-wir e single phase ZCA2xxxxxxx 3S 2.5 20 1 1.0 2- or 3-wire single phase ZCC2xxxxxxx 4S 2.5 20 1 1.0 3-wire single phase ZC5Wxxxxxxx 12S 30 200 2 1.0 3-wire wye, network meter (w ithout voltage disconnect l ink). Meter style 1 Form T est Amps Class Elements K h T ype of serv ice. Do not use for c onstructi on.Figur e 3-1 shows the dimensions o f the LCD.Th is 6-digit d isplay quant ity on the LCD shows either metered quantities o r other di splayable infor mation, dep ending upon how the REX meter was programmed e ither at t he factory or using MA S. See Ap pendix B, “Disp lay, ” for more in formati on. Th e REX me ter displa ys leading zeros if the mea sured energy value has fewer digi ts than t he number f or whic h it is programm ed. Real Energy Indicators.
The real en ergy indicat ors pulse at a rate proportional t o kWh consum ption. Th e center square indicator p ulses to indicate pulses of K h. E ach square indica tor pulse ( turns on and off) indica tes 1 K h. A single transitio n (on-to-off or off-to-o n) indica tes ? K h. The arrows toggl e for each K e. This mean s that a sing le transiti on of an ar r ow pulse (off-to-on or on-to-o ff) r epresents K e (see T able 2-1 for a list of K e based on mete r form). Th e left arrow ind icates energy being received, and th e right arrow indicates en ergy be ing deliv ered. Wh en the v alue in t he displ ay quan tity is a demand quantity, k W is displayed on the LC D, as shown i n Figure 3-4. When the valu e in the disp lay quantity is a n energy q uantity, kW h is displaye d on the LCD, as shown in Figure 3-5. Figure 3-4. L CD displa ying a sam ple deman d value f or TOU ra te D Figure 3-5. L CD displa ying a sam ple 5-digit energy value for T OU rate C Operati ng Mo de The normal operation of the RE X meter is to p rocess and store meterin g data while the LC D scrolls through its displa y list. While operating, the test LED (see Figure 4-1) transmits t est pulses proportional to metered ener gy. Each p ulse repr esents one K h of energy. S ee “Op tical Pulse Outputs” on page 4 -1 for mo r e informa tion. Received energy arrow Delivered energy arrow K h pulse ind icator After the initial LCD test, t he display wi ll then scrol l thr ough all pr ogrammed displayab le item s before beginning the disp lay cycle agai n with th e first displaya ble item. The meter p erforms a self test at p ower restoration and once every 2 4 hours to make sure it is o perating c orrectly. The self test en sures that the REX m eter is functioning properly and tha t its displayed q uantities are accurat e. See “Met er Self T est” on page 5-1 for m ore information o n self tests, errors, an d statuses.
Resetting the REX Meter When usin g the o ptical port to issue c ommands to the REX meter, the optical password must be u sed. The op tical password can be sp ecified whe n the REX meter is ordered. Addit ionally, the optical pas sword can be changed u sing Elster Electric ity meter su pport soft ware. Using the o ptical port requires removing the m eter cove r and plac ing an o ptical probe onto the op tical port t hat is molded onto the f ace of the m eter’ s i nner housing. The meter can also be in structed to pe rform the dem and res et im me di ate l y. In all demand reset occu rrences, the meter copi es the present billing data and stores it i n the demand r eset data area. This data is referred to as previ ous bill ing data becau se its general p urpose is t o preserve the data as o ne billin g period ends and the next bi lling peri od begins. T he meter stores only one copy of the p revious bill ing data. T he next de mand reset overwrites whatever i s currently stored as the previous billing d ata. Th e demand r eset data area copy can b e read by MAS. The clear current billin g data is performed immedia tely when t he REX me ter receives the c ommand over the 900 MHz network. Clear Data This procedure is used in the m eter shop bef ore installing the meter i n the field.The source for the optical pu lse output is kWh of the metered quantity (see “Metered Energy” on p age 2-3). Th e K h is equal to 1.0 Wh per pul se. Note: If the me tered quanti ty is kW h net, the test L ED output is kWh delive red. Figure 4- 1. T est LED lo cation Test LED Meter nameplate T echnical Manual REX Meter N o field calib rations or a djustments are required to ensure accurate operation of the meter. It is norm al, however, to test i nstalled REX m eters periodical ly to ensu re accurate bil ling. T esting procedures are the s ame regardless of the type of meter b eing tes ted.
Additiona lly, the R EX met er performs a self test every 24 ho urs and after any power restoration t o determin e if it is oper ating properly. Th e self test ensures that the R EX meter is function ing properly and its d isplayed qu antities a r e accurate. Any errors encou ntered will be displayed on the L CD. The self test in corporates a se ries of electronic analyses verif ying many asp ects of the RE X meter. After any power restoration, all of th e LCD segm ents will b e tur ned on brief ly before begi nning the disp lay seq uence. Elst er Electricit y does not recommend ope rating th e REX mete r when it is displayi ng an error code. Status cod es indicat e the present opera ting cond itions; status codes d o not indicate a problem. Error codes. Error codes are displayed on the LCD by an E and a 5-digit cod e. The code indicate s the specific conditio n affecting the meter op eration. Se e Figure 5-1 fo r a sample error code displ ayed on t he meter LC D. T able 5 -1 describes the different erro r condition s and their a ssociated codes. Error codes are appen ded to t he display l ist automatic ally wh en the con dition causing the error code exi sts. Error codes can be dis played in combinat ion ( E00101, for exam ple), indi cating that more than one error conditio n has been detected. In most case s, the meter will need t o be returned to the fact ory for repair or r eplacemen t. T echnical Manual REX Meter Error co nditions an d codes E00000: R OM checksu m error. This code ind ica tes a p r obl em wi th th e met er’ s pr ogram. If th is code is displaye d on the LCD, the REX meter should be r eturned to the fa ctory fo r repair or replacemen t. E00001: improper meter eng ine error. This cod e indicate s that the me ter engine pro gram ma y be corr upt or is not executing corr ectly. This error condi tion is typica lly triggered when the microcontroller fa ils to reinitiali ze the meter en gine.
If the co de is display ed on the LCD, the REX met er should be r eturned to the factory fo r repair or replacem ent. E00010: E EPROM w rite error. This code indicates the mete r had a problem storing meter data in its non volatile E EPROM. Th e REX me ter should be returned to the facto ry for repair or replacem ent. E00100: t able CRC error. This code in dicates a possi ble error in the REX met er’ s pr ogr amm ing. Dep end ing on w hich area of th e meter i s af fect ed, b il ling data ma y not be reliably accumu lated wh ile this error conditio n exists. T he REX meter shou ld be returned to the fact ory for repair or replacemen t. E01000: co nfigurat ion error. This code indicates a problem with the m eter’ s config uration. If the er ror c ontinues a fter r epr ogramming, the met er should be returned to the facto ry for repair or replacem ent. E10000: power fail data save error. This code indicat es that the data saved in nonvolat ile EEPR OM durin g a power f ailure may be i nvalid. Th is error will be displayed when po wer is restored to th e meter, an d a self check has discove r ed an error with the E EPROM data a fter a pow er fail data sav e. The REX meter should be r eturned to the factor y for r epair o r repl acement. Co nditio n Code ROM check sum error E 0 0 0 0 0 Improper meter en gine oper ation error E 0 0 0 0 1 EEPRO M write error E 0 0 0 1 0 T a b l e C R C e r r o r E 00100 C o n f i g u r a t i o n e r r o r E 01000 P o w e r f a i l d a t a s a v e e r r o r E 10000 The REX meter di splays status c odes as an in dication of the operational status of t he meter. Unli ke error codes, the s tatus code does not indicate a pr oblem with the REX met er. See Figure 5-2 for a sample st atus code displayed on the meter LCD. T abl e 5-2 describes the dif ferent c onditions and their codes. Stat us codes c an be displ ayed in comb inat ion ( F0 1010, for exampl e), indicatin g that on e or more status condi tions have b een detected. Figure 5- 2.